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The compressors and the turbine are assumed to run on a single shaft in the recompression cycle in order to simplify the design and reduce capital costs. This method introduces controllability issues, however, and the transient operation of the cycle must use finely tuned controllers. The main compressor inlet runs very near the critical point of CO2, where fluid properties are highly variable. Therefore, the performance of the cycle is very sensitive to control of the main compressor inlet conditions. Aspects of cycle control are discussed in Tri Trinh’s SM thesis and he has developed a code (TSCYCO) that models the cycle under a variety of transients [Trinh, 2009], [Kao, 1984]. TSCYCO models the response of the entire PCS and allows the user to adjust parameters which operate a set of control valves. Dostal’s main goal in CYCLES was to size heat exchangers and to optimize the configuration of the recompression cycle for maximum efficiency. Optimizing the S-CO2 cycle allows for a comparison with the traditional Rankine cycle, to determine whether the cycle can achieve economic competitiveness beyond that of Gen III+ reactors when coupled to Gen IV reactor designs like the SFR. Dostal’s results showed that the S-CO2 cycle can be very competitive in efficiency, especially as turbine inlet conditions are increased, as shown in Figure 2.4. Figure 2.4: Efficiency Comparison of S-CO2 Recompression Cycle and other Cycles [Dostal, 2004] 2.2 CYCLES to CYCLES III CYCLES III is the latest edition of a code that models the performance of an S-CO2 power conversion system, for either a simple recuperative Brayton cycle or a Recompression cycle. It was originally written as CYCLES by Vaclav Dostal and was used as the main analysis 25PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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